JavaScript 对象中的构造函数 [英] Constructors in JavaScript objects

问题描述

JavaScript 类/对象可以有构造函数吗?它们是如何创建的?

Can JavaScript classes/objects have constructors? How are they created?

推荐答案

使用原型:

function Box(color) // Constructor
{
    this.color = color;
}

Box.prototype.getColor = function()
{
    return this.color;
};

隐藏颜色"(有点类似于私有成员变量):

Hiding "color" (somewhat resembles a private member variable):

function Box(col)
{
   var color = col;

   this.getColor = function()
   {
       return color;
   };
}

用法:

var blueBox = new Box("blue");
alert(blueBox.getColor()); // will alert blue

var greenBox = new Box("green");
alert(greenBox.getColor()); // will alert green

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